Ignore objects for navigation in viewport
You can make them unselectable.
In the outliner click on the funnel icon to open the filter controls. Enable the controls for selectability:
The arrow icon controls if an object is selectable.

Just for reference, the other icons are:
Selectability (mouse cursor icon)
This is useful for if you have placed something in the scene and do not want to accidentally select it when working on something else.
Eye hides object in the viewport
Camera prevents the object from rendering
Monitor: Hides the object in all viewports
Square with a circle: Holdout.
Twisted Arrow: Indirect light only
For more info on how to use the outliner read:
https://docs.blender.org/manual/en/latest/editors/outliner/index.html